An AA5 or AA5a is an excellent choice. Having 500hrs on type and owned 4 of them I can vouch it is an excellent machine to fly, however there are somethings to be aware of, firstly when flying. An AA5/AA5a will not do 120knots, an AA5B Tiger will but an AA5 or AA5a will not. AA5/AA5a cruises at 100knots.
Average for an AA5/AA5a =34litres an hour. AA5B =40litres an hr.
AA5= Traveler (150hp)
AA5A= Cheetah (150hp but with larger tailplane)
AA5B= Tiger (180hp)
Next thing is to appreciate that AA5's of all varieties like runway...anything less than 600 metres and you need to be getting the calculator out.
Some people knock noselegs off but as long as you are aware that they are delicate you will be ok.
Then there is the issue of de-bonding. AA5's of all varieties made between '74 and '77 had serious de-bonding issues due to bad glue commonly called 'purple passion' which whilst curable with rivetting can seriously empty your wallet..you have been warned!
Good Luck and enjoy...